LONDON - British Home Secretary Jacqui Smith Monday told lawmakers Britons must raise a strong voice to let terrorists know their beliefs are rejected.

Smith recounted the events that led to the discovery of two car bombs in London Friday and the attack on Glasgow Airport at the House of Commons, cautioning lawmakers the investigation is still in its early stages and no conclusions can yet be drawn.

Smith said the government has had four meetings to coordinate its response. Security measures have been stepped up, including more extensive stop-and-search of vehicles and pedestrians, and increased protection around airports, she said.

"Terrorism is a serious threat to us all," Smith said. "We must ensure our resources, capability and legislation support our common endeavor to defend the shared values of this country from terror. ...

"Terrorists are criminals whose victims come from all walks of life, communities and religious backgrounds. Terrorists attack the values that are shared by all law-abiding citizens. As a government, as communities, as individuals, we need to ensure that the message of the terrorists is rejected."